Improvement in blowers for chimney-stacks



UNrTED STATES NATHANIEL L. BLANCHARD, OF SPUYTEN DUYVIL, NEW YORK.

IMPROVEMENT IN BLOWERS FOR CHININEV-STACKS.

Specification forming part of Letters Patent No. 117,252, dated July 25, 1871.

To all whom fit may concern: I

Beit known that I, NATHANIEL L. BLANCHARD, of Spuyten Duyvil, in the county or' Vestchester and State of New York, have invented a new and useful Improvement in Blower for Chimney- Stacks; and l do hereby declare that the following is afull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompa-nying drawing forming part of this specification.

The object of this invention is to furnish simple and efficient means for increasing the draught of chimneys, designed especially for the chimney-stacks of steam-engine boilers; and it consists in the arrangement ot' a simple fan-blower, operating' to produce a continuous upward cnrrent, as hereinafter more fully described.

In the accompanying drawing, Figure 1 represents a vertical section of the arrangement on the line .fr x of Fig. 2. Fig. 2 is ahorizontal section on the line y y of Fig. 1.

Similar letters oi'reference indicate corresponding parts.

'A represents the blower-cash] B is a short section of a semi-cylinder with chambers C and D at its ends which communicate with the iiue, and through which the smoke and products of combustion pass. E and F are the sides, which extend up from the curved portion B, with cen- 'tral orifices G Gr through them whichcommunicate with the chambers C and D. The chambers 'C and D are closed at top, so that the smoke and gaseous products of combustion from the tirebox are compelled to pass from those chambers through these orices, and are brought in contact with the wings ofthe blower. I is the shaft and J the wings of the blower.

. It will be observed that the shaft is supported by the chimney or casing, and that it is placed one side of the center or in a position where the wings just clear the cylinder on one side, as seen -a round smoke-stack or chimney the iian ged top and bottom plates (N and O) form the connection with the stack. In a brick chimney-stack the casing A may be dispensed with, as the semicylinder Band the chamber C D may be supported by the masonry.

After a good deal of experience I have found that it is more advantageous to draw the smoke and gases from the lire-box through the boilertlues tha-11 to force or push them, as is usually done; and I have found that the simple fanblower, when arranged as herein shown and described, answers the purpose admirably.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The top-closed chamber C D, the semi-cylindrical side and top-opened case B, the fan I J, and the top and bottom-opened case A N O, all arranged together between the fire box and smoke-stack of an en gine-boiler, and combined, as described, for the purpose of drawing the products of combustion from the lire-box through plate O intr a close chamber, C D, which opens only into the sides ofthe fan-case, and of thence transferring said products directly into the smokestack, thus allowing no smoke or gas to reach the chimney without passing through the fan. NATHANIEL L. BLANCHARD.

Witnesses:

GEO. W. MABEE, ALEX. F. ROBERTS. 

